Power transmission.



Patented July 3|, I900.

A. LUUMIS.

POWER TRANSMISSION.

ion flied Sept. 29, 189

(No Model.)

NI'TED STATES T OFFlQs ALLEN to'oMrs, or JACKSON, MICHIGAN;

eowER TRANSMISSION;

SPECIFICATION forming part of maefsratent no. 654,903, dated July e1, 1906; rt iitaii'ot'fi ea Septemlir za gaer js'erial No. 732,061. (No mtdel.)

To all whom it may concern: l

'Be it known that I, ALLEN LooMIs, of Jackson, in'the county of Jackson and State of Michigan, have invented certain new and-useful Improvements in Power Transmissions,

of which the following is a specification.

My invention relates to improvements in power transmissions in which power is trans= mitted from the cranks of a reciprocating en-' gine to two rotating parts so driven that a varying ratio of their speeds may be automatically compensated for. n

In the drawings, Figures 1, 2, and 3 present various views of a preferred form of the mechequal angular velocities, aswhen the vehicle istnrning a'curve; the solid cranked portion revolves about the axis of the divided shaft with an angular velocity which is the mean of the angular velocities of the divided portions. Compensation is automatically ef fected, as in the usual dilferential gear, by the rotation relative to the cranked portion; the constituent parts of which are numbered 1 to 6, inclusive; of the parts numbered 7 to 11, incl u'sive,which are in Fig. 2 cross-hatched in a direction contrary to that in which are cross-hatched the constituent parts of the cranked portion. The criterion of proper acanism. Fig. 1 is a View normalto the plane tion is that when the cranks are at rest and of the two crank-pins. Fig, 2 is asection through the centers of the shaft and crank; pins. Fig. 3 is an end view.

Throughout all figures'similar numerals refer to similar parts,

. In the drawings the parts 11 are journals, 2 2 are cranks, 3 3 are hollow crankpins, and 4 4: are crank-disks. The two parts, each of which consists of one each of the above-mentioned elements, are further united, as subsequently described, and held firmly together at a proper distance by the two bolts 5 5 and the distance-pieces 6 6. Of

the latter one only is shown-namely, in Fig. 7 7 are the two portions of the divided shaft. Each has bored in its inner end a hole which serves as a bearing for one of the journals 1 1. Upon the inner ends of the shaft-sections 7 7 are two spur-gears 8 8, each 5 of which meshes with one of the spur-gears 9 9. 9 9 are each integral with one of the short shafts or spindles 1O 10, each of which passes through one of the hollow crank-pins, which serve as bearings. The spurgears 6 11 11 are then keyed upon the shafts 10 10.

Finally the crank-disks 4 4 are united by the bolts 5 5 and distance-pieces 6 6 in such a manner that the spur-gears 11 11 mesh properly with each other. Whenthe port-ions of the divided shaft are constrained to turn with equal angular velocities, as in the case of the wheels of a vehicle when the vehicle is moving in a straight line, the parts shown all re main in fixed relation to each other, rotating as a solid piece about the common axis of the shaft-sections. When, however, the shaft sections are constrained to rotate with unof said gear-wheels being fixedly mounted upon the portions of the divided shaft, the remainder turning about bearings carried by the driving portion, said train of gears automatically compensating for a difierence of angular velocities of said driven portions.

2. Mechanism for the transmission of power, consisting of a divided shaft each portion of which ,is driven, an intermediate cranked driving portion loosely mounted between the inner ends of the divided shaft, said cranked -portion comprising two hollow crank-pins, means at their outer ends for mounting said cranked portion so that it may revolve about the same axis of rotation as the divided shaft, means at their inner ends for fastening them together, and bearings for a train of gears; said train of gears consisting of toothed-wheels having substantially-cylindrical pitch-surfaces, two of said toothed wheels being fixedly mounted upon the portions of the divided shaft, and the remainder turning in hearings in the driving portion, said train of gears being in motion relative to the driving portion,

IOv

when the driven portions are revolving with unequal angular v'elocities, automatically compensating for the differential motion.

3. Mechanism for the transmission ofpower, consisting of the following parts, namely: first, a divided shafteach portion of which has fixedly mounted near its inner end one part of a bearing; second, an intermediate cranked portion mounted upon the comple mentary parts of said bearings and freely turning-thereon, said cranked portion com prising two hollow crank-pins, means for fix ing them at their outer ends tosaid parts 9f bearings, and means for fastening them to? gether at their inner ends; third, a train of compensating gears for permitting a differential motion of the parts of said divided shaft, said train of gears consisting of the followingn-amed elements: two spur gears meshing with each other, fixedly mounted upon the inner ends of two spindles which rotate freely within the crank-pins fixedly mounted upon the outer ends of said spindles two other spurg'ears and,r=fixedly mounted at approximately the inner ends of the portions of the divided shaft, two additional spur-gears, each one of which meshes with one of the last-mentioned spnr=gears 4. In a compensating driving mechanism,

the combination of the shaft-sections, the

crank-pins independent of said sections but adapted to be rotated about the prolonged axes of said shaft-sections, said crank-pins being rigidly connected together; the small shafts revoluble insaid crank-pins; the gears fixed upon the ends of said small shafts, one gear of one shaft meshing with the corresponding gear of the f other shaft; and the gears fixed upon said shaft-sections andmeshing with the other of said gears on said small shafts, substantially as set forth.

" 5. In a compensating driving mechanism,

the combination with two shaft-sections ternitially separated but, supported in aline- 'ment';" of the two cranks located between the neighboring ends of said shaft-sections and 'independent thereof but adapted to be re volved about the common axial line there- .of', said cranks being rigidly connected; and mechanism carried by said cranks and engag- 

